2.c

MAX7219的驱动程序

//The Drivers for MAX7219
//made by OurWay

#include<reg52.h>
#include<intrins.h>

//定义显示数字0-9数组
code unsigned char LEDcode[]={0x7e,0x50,0x6D,0x79,0x53,0x3B,0x3F,0x70,0x7F,0x7B,0x00};
//code unsigned char LEDcode[]={0x7e,0x30,0x6D,0x79,0x33,0x5B,0x5F,0x70,0x7F,0x7B,0x00};

sbit IO7219=P3^4;
sbit CLK7219=P3^6;
sbit CS7219=P3^5; //根据实际情况定义

sbit ACC0=ACC^0;
sbit ACC7=ACC^7;

//Send 8bit data
void SendByte7219(unsigned char Dat)
{
unsigned char i;
ACC=Dat;
for(i=8;i>0;i--)
        {
         IO7219=ACC7;
         CLK7219=1;
         _nop_();
         _nop_();
         CLK7219=0;
         ACC=ACC<<1;
        }
}

//Send Command & Data
void Send7219(unsigned char CMD,unsigned char Dat)
{
CLK7219=0;
CS7219=0;
IO7219=0;
SendByte7219(CMD);
SendByte7219(Dat);
CS7219=1;
}

//The initialation MAX7219
void Init7219(void)
{

Send7219(0x0a,0x08); //Intensity Register Format(31/32)
Send7219(0x0b,0x03); //Scan-Limit Register Format(Display digits 0 1 2 3 4 5 6 7)
Send7219(0x09,0x00); //Decode-Mode Register Examples(No decode for digits 7–0)
Send7219(0x0f,0x00); //Display-Test Register Format(normal operation)
Send7219(0x0c,0x01); //Shutdown(normal operation)
}

void Clear7219(void)
{
unsigned char i;
for(i=8;i>0;i--)
         {
          Send7219(i,0x00);
         }
}
void delay()
{
	unsigned int n;
	n=10000;
	while(n--);
}
main()
{
delay();
Init7219();
Clear7219();
//P1|=0x80;
        {
         Send7219(0x01,LEDcode[5]);									
         Send7219(0x02,LEDcode[6]+0x80);
         Send7219(0x03,LEDcode[7]);
         Send7219(0x04,LEDcode[9]);
       Send7219(0x05,LEDcode[5]);
       Send7219(0x06,LEDcode[6]+0x80);
       Send7219(0x07,LEDcode[7]);
       Send7219(0x08,LEDcode[8]);
	 //  Send7219(0x0c,0x01);
     //   Clear7219();
	   }	  
	   while(1);
	   }